diff --git a/src/audio.h b/src/audio.h
index f1cbee06..d2f99bd1 100644
--- a/src/audio.h
+++ b/src/audio.h
@@ -26,6 +26,9 @@ class Audio
 {
 public:
     static void Setup(int channels);
+
+private:
+    Audio() {}
 };
 
 } /* namespace lol */
diff --git a/src/forge.h b/src/forge.h
index bbf279b8..390e50fc 100644
--- a/src/forge.h
+++ b/src/forge.h
@@ -28,6 +28,9 @@ public:
     static int Register(char const *path);
     static void Deregister(int id);
     static Font *GetFont(int id);
+
+private:
+    Forge() {}
 };
 
 } /* namespace lol */
diff --git a/src/platform.h b/src/platform.h
index a5043cfd..afe9bf8d 100644
--- a/src/platform.h
+++ b/src/platform.h
@@ -26,6 +26,9 @@ class Platform
 {
 public:
     static int GetMouseCount();
+
+private:
+    Platform() {}
 };
 
 } /* namespace lol */
diff --git a/src/profiler.h b/src/profiler.h
index 27a1a5ce..4a035142 100644
--- a/src/profiler.h
+++ b/src/profiler.h
@@ -48,6 +48,9 @@ public:
     static void Stop(int id);
     static float GetAvg(int id);
     static float GetMax(int id);
+
+private:
+    Profiler() {}
 };
 
 } /* namespace lol */
diff --git a/src/ticker.h b/src/ticker.h
index dc6bb5e3..a442abd2 100644
--- a/src/ticker.h
+++ b/src/ticker.h
@@ -45,6 +45,9 @@ public:
 
     static void Shutdown();
     static int Finished();
+
+private:
+    Ticker() {}
 };
 
 } /* namespace lol */
diff --git a/src/tiler.h b/src/tiler.h
index dbe2bd9b..675db1de 100644
--- a/src/tiler.h
+++ b/src/tiler.h
@@ -29,6 +29,9 @@ class Tiler
 public:
     static TileSet *Register(char const *path, ivec2 size, ivec2 count);
     static void Deregister(TileSet *);
+
+private:
+    Tiler() {}
 };
 
 } /* namespace lol */